Loosing that much coolant, I would suspect a head gasket or a cracked head. The coolant is leaving as steam, and you cant see it.

Take it to a good shop and ask them to pressure test the cooling system. They could also look for signs of blown gasket by passing an exhaust analyzer of the open neck of the radiator when the engine is hot. The analyzer will detect the CO in the coolant, if it is there.

Loosing that much coolant, I would suspect a head gasket or a cracked head. The coolant is leaving as steam, and you cant see it.

Take it to a good shop and ask them to pressure test the cooling system. They could also look for signs of blown gasket by passing an exhaust analyzer of the open neck of the radiator when the engine is hot. The analyzer will detect the CO in the coolant, if it is there.

Curly

There is a good chance that I do have a cracked head or a leaking head gasket. But it still doesn't explain why I am losing oil pressure. I would like to understand this before working on the coolant loss.

If your not getting oil pressure your problems will be more then just burning some coolant. Does your oil light come on when the guage drops? The guage dropping to zero could just be from a bad guage due to another problem.

There is a good chance that I do have a cracked head or a leaking head gasket. But it still doesn't explain why I am losing oil pressure. I would like to understand this before working on the coolant loss.

I can't think of much of an answer to that, except maybe there is a mechanical problem with the oil pressure relief valve in the pump. Have you put an actual mechanical gauge on it yet? Even with a new sender, there could be electrical issues causing a false reading.

i'd honestly start by having the oil pressure checked from a mechanical gauge and go from there. most factory dash guages wont show "actual" pressure since it would freak some drivers out etc. as long as you have at least 10psi of oil pressure per 1000 rpm on a mechanical gauge when its hot then I wouldnt worry to much. If you have less, then check into why. Are you running 5w30 oil or ?

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i'd honestly start by having the oil pressure checked from a mechanical gauge and go from there. most factory dash guages wont show "actual" pressure since it would freak some drivers out etc. as long as you have at least 10psi of oil pressure per 1000 rpm on a mechanical gauge when its hot then I wouldnt worry to much. If you have less, then check into why. Are you running 5w30 oil or ?